Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

Contents

mkl_?csrmv

Computes matrix - vector product of a sparse matrix stored in the CSR format (deprecated).

Syntax

void
mkl_scsrmv
(
const
char
*transa
,
const
MKL_INT
*m
,
const
MKL_INT
*k
,
const
float
*alpha
,
const
char
*matdescra
,
const
float
*val
,
const
MKL_INT
*indx
,
const
MKL_INT
*pntrb
,
const
MKL_INT
*pntre
,
const
float
*x
,
const
float
*beta
,
float
*y
);
void
mkl_dcsrmv
(
const
char
*transa
,
const
MKL_INT
*m
,
const
MKL_INT
*k
,
const
double
*alpha
,
const
char
*matdescra
,
const
double
*val
,
const
MKL_INT
*indx
,
const
MKL_INT
*pntrb
,
const
MKL_INT
*pntre
,
const
double
*x
,
const
double
*beta
,
double
*y
);
void
mkl_ccsrmv
(
const
char
*transa
,
const
MKL_INT
*m
,
const
MKL_INT
*k
,
const
MKL_Complex8
*alpha
,
const
char
*matdescra
,
const
MKL_Complex8
*val
,
const
MKL_INT
*indx
,
const
MKL_INT
*pntrb
,
const
MKL_INT
*pntre
,
const
MKL_Complex8
*x
,
const
MKL_Complex8
*beta
,
MKL_Complex8
*y
);
void
mkl_zcsrmv
(
const
char
*transa
,
const
MKL_INT
*m
,
const
MKL_INT
*k
,
const
MKL_Complex16
*alpha
,
const
char
*matdescra
,
const
MKL_Complex16
*val
,
const
MKL_INT
*indx
,
const
MKL_INT
*pntrb
,
const
MKL_INT
*pntre
,
const
MKL_Complex16
*x
,
const
MKL_Complex16
*beta
,
MKL_Complex16
*y
);
Include Files
  • mkl.h
Description
This routine is deprecated. Use mkl_sparse_?_mvfrom the
Intel® oneAPI Math Kernel Library
 Inspector-executor Sparse BLAS interface instead.
The
mkl_?csrmv
 routine performs a matrix-vector operation defined as 
y := alpha*A*x + beta*y
or 
y := alpha*A
T
*x + beta*y,
where:
alpha
 and
beta
 are scalars,
x
 and
y
 are vectors,
A
 is an
m
-by-
k
 sparse matrix in the CSR format,
A
T
 is the transpose of
A
.
This routine supports a CSR format both with one-based indexing and zero-based indexing.
Input Parameters
transa
Specifies the operation.
If
transa
 =
'N'
 or
'n'
, then
y
 :=
alpha
*
A
*
x
 +
beta
*
y
If
transa
 =
'T'
 or
't'
 or
'C'
 or
'c'
, then
y
 :=
alpha
*
A
T
*
x
 +
beta
*
y
,
m
Number of rows of the matrix
A
.
k
Number of columns of the matrix
A
.
alpha
Specifies the scalar
alpha
.
matdescra
Array of six elements, specifies properties of the matrix used for operation. Only first four array elements are used, their possible values are given in
Table “Possible Values of the Parameter
matdescra
 (
descra
)”
. Possible combinations of element values of this parameter are given in
Table “Possible Combinations of Element Values of the Parameter
matdescra
”
.
val
Array containing non-zero elements of the matrix
A
.
Its length is
pntre
[m-1] -
pntrb
[0]
.
Refer to
values
 array description in CSR Format for more details.
indx
For one-based indexing, array containing the column indices plus one for each non-zero element of the matrix
A
. For zero-based indexing, array containing the column indices for each non-zero element of the matrix
A
.
Its length is equal to length of the
val
 array.
Refer to
columns
 array description in CSR Format for more details.
pntrb
Array of length
m
.
This array contains row indices, such that
pntrb
[
i
] -
pntrb
[0]
 is the first index of row
i
 in the arrays
val
 and
indx
.
Refer to
pointerb
 array description in CSR Format for more details.
pntre
Array of length
m
.
This array contains row indices, such that
pntre
[
i
] -
pntrb
[0]-1
 is the last index of row
i
 in the arrays
val
 and
indx
.
Refer to
pointerE
 array description in CSR Format for more details.
x
Array, size at least
k
 if
transa
 =
'N'
 or
'n'
 and at least
m
 otherwise. On entry, the array
x
 must contain the vector
x
.
beta
Specifies the scalar
beta
.
y
Array, size at least
m
 if
transa
 =
'N'
 or
'n'
 and at least
k
 otherwise. On entry, the array
y
 must contain the vector
y
.
Output Parameters
y
Overwritten by the updated vector
y
.

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.